Hello again, need some help please.

Lopt · 10-01-2014, 08:11 PM

Hello again.

So we connected the fuel pump with a copper wire and here are the results.

https://docs.google.com/file/d/0B5Lc...hUNGJCMDA/edit

It looks we are having a fuel problem though not sure where to go from here.. If the fuel pump is working like that, why wouldn't it work while the ignition is on?

As my friend was exclaiming in the video, that's the strongest start we've gotten out of her so far. Granted it does sound like we need to play with the distributor a bit as well.

btwilson86 · 10-02-2014, 05:26 AM

Sweet, a result lol. The fuel pump doesn't start pumping until the AFM has air moving through it. I would now double check your air flow meter connection is good and that it's wiring is also in good shape. Its possible that it didn't continue to run because the ecu isn't receiving a good signal from your air flow meter. If that all looks okay then I'd start double checking vacuum lines. As long as your distributor rotor is pointing at the #1 plug wire with the engine at TDC on the compression stroke, the engine should run just fine. Setting the base timing just fine tunes the spark for optimal performance. If your distributor is installed correctly, which I believe it is from your earlier video, I don't think you need to mess with it at this point.

I've done an engine swap a couple of times on these cars, and one of the times the engine would not run on its own until I jumped the pins in the diagnostic box to bypass the fuel pump. I don't think the fuel system pressurized enough from just trying to start it, so we just had to do an initial prime because I didn't have to repeat the process again once the car ran on its own.

Lopt · 10-03-2014, 11:16 PM

btwilson,

Is there a good way of checking to see if the AFM has that connection we need other than just visual? Might seem like a mundane question for you season pros.. but I'm still really new to all this.

Thanks again

Lopt · 10-05-2014, 07:30 PM

Okay, so we took an OEM meter to the AFM, hooked up E2 - VC and got less than the recommended 200-400 ohms..

Getting anywhere from 150-190 and it's not very stable.

We're about to head to a pick and pull to take a wiring harness and maybe the AFM off of a 7mge Cressida we happened across a month back or so.. the car seems to be in good condition other than the front end collision it looks to have gotten into..

Anyhow.. not sure where to go from there.. all the vacuum lines are still good.. so at this point I'm pretty sure it's electrical.

Lopt · 10-05-2014, 10:28 PM

I've got one more thing I've been concerned about since putting the car back together. I have a picture here showing two plugs that I haven't been able to locate.. While I was tearing the car apart I forgot to label these and it's been making me scratch my head ever since.

I'm not sure if these are meant to actually connect to anything or not.

please let me know.

btwilson86 · 10-12-2014, 07:27 PM

I think extra connectors under the intake manifold is normal, they could be for the different transmission options/abs/etc. I don't immediately recognize those ones in particular.

Were you able to find a different AFM and see if that made any difference? As far as testing the wiring to the sensor, I would get a look at the wiring diagrams and check continuity of each of the AFM wires between each end an make sure there are no breakes or unusually high resistance.

10-02-2014, 05:26 AM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Sweet, a result lol. The fuel pump doesn't start pumping until the AFM has air moving through it. I would now double check your air flow meter connection is good and that it's wiring is also in good shape. Its possible that it didn't continue to run because the ecu isn't receiving a good signal from your air flow meter. If that all looks okay then I'd start double checking vacuum lines. As long as your distributor rotor is pointing at the #1 plug wire with the engine at TDC on the compression stroke, the engine should run just fine. Setting the base timing just fine tunes the spark for optimal performance. If your distributor is installed correctly, which I believe it is from your earlier video, I don't think you need to mess with it at this point. I've done an engine swap a couple of times on these cars, and one of the times the engine would not run on its own until I jumped the pins in the diagnostic box to bypass the fuel pump. I don't think the fuel system pressurized enough from just trying to start it, so we just had to do an initial prime because I didn't have to repeat the process again once the car ran on its own. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

10-05-2014, 10:28 PM	#5
Lopt Stock Join Date: Dec 2013 Location: phoenix Posts: 11	I've got one more thing I've been concerned about since putting the car back together. I have a picture here showing two plugs that I haven't been able to locate.. While I was tearing the car apart I forgot to label these and it's been making me scratch my head ever since. I'm not sure if these are meant to actually connect to anything or not. please let me know. Attached Thumbnails

10-12-2014, 07:27 PM	#6
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	I think extra connectors under the intake manifold is normal, they could be for the different transmission options/abs/etc. I don't immediately recognize those ones in particular. Were you able to find a different AFM and see if that made any difference? As far as testing the wiring to the sensor, I would get a look at the wiring diagrams and check continuity of each of the AFM wires between each end an make sure there are no breakes or unusually high resistance. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

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10-01-2014, 08:11 PM	#1
Lopt Stock Join Date: Dec 2013 Location: phoenix Posts: 11	Hello again. So we connected the fuel pump with a copper wire and here are the results. https://docs.google.com/file/d/0B5Lc...hUNGJCMDA/edit It looks we are having a fuel problem though not sure where to go from here.. If the fuel pump is working like that, why wouldn't it work while the ignition is on? As my friend was exclaiming in the video, that's the strongest start we've gotten out of her so far. Granted it does sound like we need to play with the distributor a bit as well.

10-03-2014, 11:16 PM	#3
Lopt Stock Join Date: Dec 2013 Location: phoenix Posts: 11	btwilson, Is there a good way of checking to see if the AFM has that connection we need other than just visual? Might seem like a mundane question for you season pros.. but I'm still really new to all this. Thanks again

10-05-2014, 07:30 PM	#4
Lopt Stock Join Date: Dec 2013 Location: phoenix Posts: 11	Okay, so we took an OEM meter to the AFM, hooked up E2 - VC and got less than the recommended 200-400 ohms.. Getting anywhere from 150-190 and it's not very stable. We're about to head to a pick and pull to take a wiring harness and maybe the AFM off of a 7mge Cressida we happened across a month back or so.. the car seems to be in good condition other than the front end collision it looks to have gotten into.. Anyhow.. not sure where to go from there.. all the vacuum lines are still good.. so at this point I'm pretty sure it's electrical.